Canada



C. K. BROWN INCNDESCENT LAMP Filed Nov. 21 1921' INVENTOR WITNESSESATTORNEYS Patented Aug. 25, 1925.

UNITED STATES,

PATENT OFFICE.

cn nLEs KINGSLEY BROWN, or rnnrrc'ron, BRITISH COLUMBIA, CANADA.

INCAHDESGENT LAMP;

I Application filed November 21, 1921. Serial 110. 518,848.

To all whom it may cmwem:

Be it known that I, 'GHAnLEs KINGSLEY BROWN, a subject of the King ofGreat Britain, and a resident ofPenticton, Province of British Columbia,in the Dominion "of Canada, have invented certain new and usefulImprovements in Incandescent Lamps, of which the following is aspecification.

This invention relates to improvementsin incandescent lamps.

f The primary object of the invention is to provide an electric lamp ofthe above character which may be used a relatively long period withoutrenewing the filaments therein.

It is also an object of-the invention that the electric lamp be adaptedto operate at a comparatively good efficiency.

It is also within the objects of the invention that the manufacturingcost of the light be comparatively small.

Other objects will hereinafter appear in the detailed description tofollow., 1

M In carrying out the invention it is contemplated-to provide anelectric lamp of the incandescent type with a plurality of filamentswhich may be, separately and individually energized from the same sourceof supply.. In the use of such a light one filament may be used-untilburnt out and then another used etc, until all the filaments have becomeuseless and in this way increasing the life of a. lamp in directproportion to the number of filaments-employed.

The invention is illustrated by way of examplf1 in the accompanyingdrawings, in w 10 Figure 1 is a perspective view of an incandescent lampwith which thepresent invention. is incorporated, i I

' Figure 2 is a vertical sectional view of the same,

Figure'3 is a top plan view of the same. Referring to the drawings morerticularly, 10 indicates a lamp bulb whic in this instance is of a largetype, 11the screw plug or base of the lamp and 1 2 the usual cement forsecuring the base to the bulb and sealing the same.

.In thepresent case the bulb is formed with the usual ,filamentsupporting and.

sealin 'tube 13, and through which there is exten ed the wire 14, saidwire havin its upper end electrically connected to the or-screw plug 12as at 15, and having connected at its'lower end the one end of aplurality of filament wires 16. The other end of each filament wire issecured to a wire' 17 and each of the wires 17 are extended upwardlythrough thesealing tube 13 and cement 12 and connected to the lower endof a vertical tubular sleeve or socket 18 embedded in the cement 12. Inthe pres ent instance the filament wires 16 are three in number andlikewise the sockets 18 are three in number, as shownin Figure 1.

Centrally of the screw plug 11 at the u per end thereof there is.embedded in t e cement 12 an additional tubular sleeve or socket 19which has fitted therein a pin 20, said pin being reduced at its upperend as at 21 and having riveted thereto the switch blade generallyindicated by the reference numeral 22. The switch blade 22 consists uponitself, and the free ends riveted to the j adapted to serve as thecontact point or one electrode of the incandescent lamp, the

other electrode being the screw plu 11.

In the use of the present incan escent lamp, the switch 22 is 'tionedfor con necting one, of the tub ar sockets 18 with the central socket 19or pin 20, and thus connecting the wire 17 associated with the tubularsocket 18 with one electrode of the lamp. -N-ow as the screw plug 11 isinserted in the socket connected to a suitable source of electriccurrent supply .the path of f the current. would be'throughv the wire 17with whichthe switchmember 24 is connected and then through theassociated filament'wire 16 and from thence through the common wire 14to the screw plug. This filament could be used until the same is burntout and then the switch 22 would be transferred or moved so that thesame would establish a connection with another of the filaments 16, thecircuit in each instant returning through the common wire 14. As

is obvious by this arrangement the life of the lamp may be greatly thesame time in no way prolonged and at owering the eficiency of thesame.The manner in which the'switch 22 can be made to connect with thedifferent wires 17 is thought to be clearly obvious and no detaileddescription thereof need here be made. It may be mentioned however thatthe switch 22 will in no way interfere with the positioning of the plug11 in the standard form of socket.

I claim:

1. In a multiple filament incandescent lamp, a plurality of filaments,one end of each of said filaments being connected to the shell contactof the lamp, the base of said lamp having a central contact in its freeend and a plurality ofsockets corresponding in number to the filamentsarranged about said central socket, the last named sockets havingconducting walls and each of said last named sockets being electricallyconnected to the other end of one of said filaments, and

means removably positioned in the central socket and in one of the othersockets servingas a central contact 'for said lamp aiid also serving toelectrically connect the walls of one of said sockets surrounding thecentral socket with said central contact.

2. In a multiple filament e-incandescent lamp, a base, a sleeve carriedby the base providing a central socket, a plurality of other sleevesarranged circumferentially thereof also providing sockets, and a memberwhich is held in place in the sockets when the lamp is screwed into areceptacle, said member including a pin which is fitted in base, asleeve carried centrally of the base,

a plurality of circumferentially disposed non-circular sockets, and asubstantially U-shapcd member constituting a connector being held inposition when the lamp is screwed into a receptacle and being providedwith a head to make contact with a terminal of the receptacle, saidmember consisting of a pin slidable and revoluble in said centralsocket, and an L-shaped arm carried by the pin formed of a memberdoubled upon itself to provide a looped end for friotionally engagingthe walls of any of the other sockets.

CHARLES KINGSLEY BROWN.

